I've found the videos and articles for NutritionFacts.org (Youtube Channel:
https://www.youtube.com/c/NutritionfactsOrgMD/videos ) really informative. It's a non-profit, research driven site that focuses on the latest, sound research on nutrition and improving health. There are multiple studies showing people with chronic illness like MS and diabetes, who after years of suffering, were switched to a plant based diet and symptoms were mostly or entirely eliminated, and many other diseases which were improved to a greater extent with diet than with drugs. Dr. Gregor also has a video going through the top 15 causes of mortality in the USA and many are diet based, llifestyle (as in we choose to be sick) diseases. Even genetic links are far weaker than just the diet of the pregnant mom when it comes to infant and child health outcomes. Different countries/cultures have massively different rates of disease and there are causal links to diet. The focus is specifically on what the research says, and also teasing out who funds research when there's obvious conflicts of interest.
My personal stance (based on what I've read to date) is that for sure, many medications given today (sometimes over-prescribed) could instead be dealt with via diet, and eliminate all the side effects those drugs have. Here's a longer video where Dr. Gregor specifically addresses "food as medicine":